Instability of subdiffusive spin dynamics in strongly disordered Hubbard chain
Instability of subdiffusive spin dynamics in strongly disordered Hubbard chain
复制标题
强无序哈伯德链中次扩散自旋动力学的不稳定性
DOI:
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发表时间:
2019
影响因子:
3.7
通讯作者:
M. Mierzejewski
中科院分区:
文献类型:
--
作者:
M. Środa;P. Prelovšek;M. Mierzejewski
We study spin transport in a Hubbard chain with strong, random, on--site potential and with spin--dependent hopping integrals, $t_{\sigma}$. For the the SU(2) symmetric case, $t_{\uparrow} =t_{\downarrow}$, such model exhibits only partial many-body localization with localized charge and (delocalized) subdiffusive spin excitations. Here, we demonstrate that breaking the SU(2) symmetry by even weak spin--asymmetry, $t_{\uparrow} \ne t_{\downarrow}$, localizes spins and restores full many-body localization. To this end we derive an effective spin model, where the spin subdiffusion is shown to be destroyed by arbitrarily weak $t_{\uparrow} \ne t_{\downarrow}$. Instability of the spin subdiffusion originates from an interplay between random effective fields and singularly distributed random exchange interactions.
影响因子:
1.8
作者:
Bar Lev, Yevgeny;Kennes, Dante M.;Karrasch, Christoph
通讯作者:
Karrasch, Christoph
影响因子:
3.7
作者:
Friedman, Aaron J.;Vasseur, Romain;Parameswaran, S. A.
通讯作者:
Parameswaran, S. A.